In need of an education..340 vs 360.

That makes it as cool as a 340 stroked to a 416!

But .070 over...Ouch. No problems with them at all? Do you race them? If so did you fill the blocks? I assume that sonic checking beforehand would be an absolute must. Personally I would be more comfortable with a thicker bore than a few extra cubes but that's just me. :)

Yup, I'd recommend a sonic check, no doubt. Most of them will go with no sweat. Think of it this way. .070 over is only .005" PER SIDE from a .060 overbore. Especially the 71-73 360s usually have no trouble....but the last one I did I raced hell out of and it is STILL running in the same configuration in a mud truck today. I owned it about 16 years ago.